- May was much warmer than normal over much of the western US, although Central to Southern California was near average to cooler than average due to prominent marine layer intrusions. The month ended up being one of the driest May’s on record for much of the coastal regions to interior valleys in the west.
- Current conditions have warmed to seasonal or warmer than average temperatures. Short to medium term forecasts also tilt the odds to warmer than average conditions for the western US. Short term forecasts do call for some rain in the PNW, but conditions should dry out into mid-June.
- The seasonal forecast for June through August suggests a strong chance for warmer than average conditions over the western US. The precipitation forecast calls for seasonally dry conditions during the same period, with the PNW likely to be the driest region. All analog years and forecasts indicate that 2018 is highly likely to end up close to the average heat accumulation of the last five years across the majority of the western US.